Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 16, Pages 15079-15087Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03204
Keywords
conductive fiber; hierarchical structure; biosensor; nanoparticle; crack
Funding
- Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program [10062694]
- Korea Institute of Industrial Technology as Development of smart textronic products based on electronic fibers and textiles [kitech JA -19-0001]
- Gyeongi-Do Technology Development Program as Development of smart textronic products based on electronic fibers and textiles [kitech IZ-19-0003]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10062694] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Fiber-based electronics or textronics are spotlighted as a promising strategy to develop stretchable and wearable devices for conformable machine-human interface and ubiquitous healthcare systems. We have prepared a highly sensitive fiber-type strain sensor (maximum gauge factor (GF) = 863) with a broad range of strain (epsilon < 400%) by introducing a single active layer onto the fiber. In contrast to other metal-based fiber-type electronics, our hierarchical fiber sensors are based on coating carbon-based nanomaterials with responsive microbeads onto elastic fibers. Utilizing the formation of uniform cracks around the microbeads, the device performance was maximized by adjusting the number of microbeads in the carbon-coating layer. We overcoated the carbon-based coating layer of the elastic fiber with a protective polymeric layer and verified no effects on the GF and the range of strain. Our fiber sensors were repeatedly tested more than 5000 times, exhibiting excellent cyclic responses to on/off switching behaviors. For practical applications, the hierarchical fiber sensors were sewed into electrical fabric bands, which are integrable to a wireless transmitter to monitor waveforms of pulsations, respirations, and various postures of level of bending a spinal cord.
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